Systems and methods for downhole fluid compatibility

Abstract

Methods for performing downhole fluid compatibility tests include obtaining an downhole fluid sample, mixing it with a test fluid, and detecting a reaction between the fluids. Tools for performing downhole fluid compatibility tests include a plurality of fluid chambers, a reversible pump and one or more sensors capable of detecting a reaction between the fluids.

1. A downhole tool, comprising:
 an inlet disposed on an exterior of the tool for engaging a formation; 
 a chamber fluidly connected to the inlet, wherein a test fluid is disposed in the chamber; 
 means for introducing the test fluid from the chamber into the formation; 
 a sensor arranged to detect a reaction taking place between the test fluid and a fluid within the formation, wherein the reaction is taking place within the formation and is detected within the formation; and 
 a controller operatively coupled to the sensor and configured to make a determination of compatibility of the test fluid with the formation fluid based on the detected reaction. 
 
   
   
     2. The downhole tool of  claim 1  wherein the chamber is a first chamber, and wherein the downhole tool further comprises a second chamber fluidly connected to the first chamber. 
   
   
     3. The downhole tool of  claim 2  further comprising:
 a third chamber fluidly connected to the first and second chambers; and 
 means for moving the contents of the first and second chambers into the third chamber. 
 
   
   
     4. The downhole tool of  claim 1  wherein the chamber is a mixing chamber having a mixing device configured to mix the contents in the mixing chamber. 
   
   
     5. The downhole tool of  claim 1  wherein the sensor is configured to measure a multi-depth resistivity property. 
   
   
     6. The downhole tool of  claim 1  wherein the sensor is configured to measure a dielectric property. 
   
   
     7. The downhole tool of  claim 1  wherein the sensor is configured to measure a nuclear magnetic resonance (NMR) property. 
   
   
     8. The downhole tool of  claim 1  wherein the sensor is configured to measure a neutron spectroscopic property. 
   
   
     9. A downhole tool for testing fluid compatibility with a subterranean formation fluid, comprising:
 an inlet disposed on an exterior of the tool for engaging a formation; 
 a first chamber fluidly connected to the inlet via a conduit; 
 a second chamber fluidly connected to the first chamber; 
 means for combining a sample fluid obtained from the formation and a test fluid disposed in the second chamber; 
 at least one sensor arranged relative to at least one of the first and second chambers such that the sensor detects a reaction taking place between the sample fluid and the test fluid; 
 a controller operatively coupled to the sensor for making a determination of the compatibility of the test fluid with the fluid sample based on the reaction; 
 a third chamber fluidly connected to both the first and second chambers, wherein the means for combining includes means for moving the contents of the first and second chambers into the third chamber; and 
 means for introducing the test fluid into the formation, wherein the at least one sensor is arranged such that the sensor can detect a reaction taking place between the test fluid and the formation fluid within the formation, and wherein the controller is configured to make a determination of the compatibility of the test fluid with the formation fluid based on the reaction. 
 
   
   
     10. The downhole tool of  claim 9  wherein the first chamber is a mixing chamber having a mixing device configured to mix the contents in the mixing chamber. 
   
   
     11. The downhole tool of  claim 9  wherein the at least one sensor measures a multi-depth resistivity property. 
   
   
     12. The downhole tool of  claim 9  wherein the at least one sensor measures a dielectric property. 
   
   
     13. The downhole tool of  claim 9  wherein the at least one sensor measures a nuclear magnetic resonance (NMR) property. 
   
   
     14. The downhole tool of  claim 9  wherein the at least one sensor measures a neutron spectroscopic property.